How can i make parts disappear/ see through at a specific distance when zooming in.

I want to quickly be able to see inside the design, like if i was modeling a house and zoomed in i could set anything closer to 3 ft. from POV be cutaway or see through? I want this to be done in the current assembly and not have to do some fly-through or other silly procedure. Like how when i zoom down and my sketch lines disappear (which i hate! and if yo know how to fix that i's appreciate that as well )

4. your screen will split, drag split just up to your featuremanager but not to far or it will shut camera edit mode down

5.uncheck Lock camera, Change field of view to about 24mm, Change distance and height to about 1000 x 1000 and change the aspect ratio so as to make the gray bars disappear, I set mine to 1.6:1 its close but not perfect.

Click OK and no you can zoom through walls or whatever your project is and edit from inside!